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Lavrushin, V. Yu.; Kopf, Achim J; Deyhle, Annette; Stepanets, M. I.

doi:10.1023/a:1023452025440

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…Low Ca with high Na fluids are distributed at the northwestern side of the MV field (i.e., groups F and G) while high Ca with low Na fluids are located at the southern side (i.e., group E; Figure 1C). Other trace element/Cl ratios show similar characteristics with typical terrestrial and marine sedimentary MVs characterized by lower Mg/Cl and higher B/Cl, Ba/ Cl, Li/Cl, and Sr/Cl ratios relative to seawater (e. g., Dia et al, 1995;Lavrushin et al, 2003;Aloisi et al, 2004;Chao et al, 2011;Farhadian Babadi et al, 2019;Chen et al, 2020).…”

Section: Resultsmentioning

confidence: 58%

“…MV fluids closed to marine environments denote similar chemical characteristics to deep marine pore fluids which originate from ancient seawater and have been altered by early diagenesis, clay dehydration, and water-rock interaction (e.g., Dia et al, 1999;Dählmann and de Lange, 2003;Hensen et al, 2004;You et al, 2004;Mazzini et al, 2007;Mazzini et al, 2009;Ray et al, 2013;Farhadian Babadi et al, 2019;Chen et al, 2020). These mechanisms result in the dissolved constituents of MV fluids generally showing lower chloride concentration, lower Mg/Cl, Ca/Cl, and δD ratios with higher Na/Cl, B/Cl, Li/Cl, Ba/Cl, Br/Cl, I/Cl, and δ 18 O ratios compared with seawater (e.g., Dia et al, 1995;Lavrushin et al, 2003;Aloisi et al, 2004;Chao et al, 2011;Farhadian Babadi et al, 2019;Chen et al, 2020). Although chemical and isotopic compositions of MV fluids in LS and LGH match most of the features, they present reverse relationship between Na/Cl and Ca/Cl (Seyfried and Bischoff, 1979;Henderson, 1982) and evidence from marine pore water (e.g., Gieskes et al, 1975;Perry et al, 1976;Lawrence and Gieskes, 1981;Gieskes et al, 1990) indicate this chemical characteristic is caused by low temperature water−rock interaction with volcanic ash and/or igneous rock.…”

Section: Discussionmentioning

confidence: 99%

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Two-End-Member Mixing in the Fluids Emitted From Mud Volcano Lei-Gong-Huo, Eastern Taiwan: Evidence From Sr Isotopes

et al. 2022

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Mud volcano is one of the most important conduits for deep seated materials to migrate upward in sedimentary basins, convergent margins, and subduction zones. Understanding their temporal and spatial characteristics and variations provides us the important information on fluid sources and chemical compositions at depth. Mud volcano Lei-Gong-Huo (MV LGH) is a unique mud volcano, which is located on the mélange formation lying on the andesitic volcanic arc. Fluids emitted from 46 mud pools in MV LGH in eastern Taiwan were sampled and their major trace constitutes as well as H, O, and Sr isotopes (87Sr/86Sr and δ88Sr) were measured. Major constitutes of the fluids are Cl−, Na, and Ca. Compared with seawater, LGH fluids have lower Cl−, δD, δ18O, Na/Cl, K/Cl, and Mg/Cl but higher Ca/Cl ratios, indicating water–rock interaction of igneous rock and the ancient seawater at the source region. This interpretation is further supported by Sr isotopes, which show low value of 87Sr/86Sr ratio down to 0.70708. The result of spatial distribution showing strong negative correlation between Na and Ca concentration as well as Ca and 87Sr/86Sr ratios indicates that two end-member mixing is the major chemical characteristic. The fluids interacting with igneous rock carry high Ca, high δ88Sr, low Na, and low 87Sr/86Sr ratio, while those interacting with sedimentary rock carry low Ca, low δ88Sr, high Na, and high 87Sr/86Sr ratio. The source from the igneous region dominates the eastern and southeastern parts of the mud pools while sedimentary source dominates the western and northwestern parts. Most mud pools show mixing behavior between the two sources. Some of the sedimentary-dominated mud pools reveal existence of residual ancient water as indicated by 87Sr/86Sr. The major factor to fractionate the stable Sr isotopes in LGH waters is the source lithology. In summary, fluids emitted by mud pools in LGH originate from two sources, which are water–rock interactions of igneous rock with the ancient seawater from the east and sedimentary rock from the west at depth, resulting from the complex geologic background of mélange formation.

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Section: Resultsmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Two-End-Member Mixing in the Fluids Emitted From Mud Volcano Lei-Gong-Huo, Eastern Taiwan: Evidence From Sr Isotopes

et al. 2022

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“…The temperatures and respective depths of fluid generation for the Sakhalin MVs were estimated by means of hydrochemical geothermometry, with reference to the 45 • C/km local geothermal gradient for South Sakhalin MV [29]. The same approach has already been successfully applied to mud volcanic systems in the Taman and Kerch peninsulas, Azerbaijan, and Kakheti (Georgia) [55,[91][92][93][94]. The fluid generation temperatures (T Mg-Li , • C) were estimated with the Mg-Li geothermometer of [95], which is valid up to 300 • C, using Mg and Li concentrations in mg/L:…”

Section: Conditions Of Sulfide Mineralization and Sources Of Materials In Ejecta Of Sakhalin Mvsmentioning

confidence: 99%

Ge-Hg-Rich Sphalerite and Pb, Sb, As, Hg, and Ag Sulfide Assemblages in Mud Volcanoes of Sakhalin Island, Russia: An Insight into Possible Origin

et al. 2021

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We characterize the mineralogy and geochemistry of Fe, Zn, Pb, Sb, As, Hg, Ag sulfide assemblages from mud masses currently extruded by the onshore South Sakhalin and Pugachev mud volcanoes (Sakhalin Island, Russia). Abundant Tl-rich pyrite in sulfide concentrate samples from the mud volcanoes coexists with common Hg- and Ge-rich sphalerite, as well as with sporadic boulangerite, robinsonite, bournonite, galena, realgar, metacinnabar, cinnabar, acanthite, and chalcopyrite. Sphalerites are remarkably enriched in Hg (locally reaching 27 wt%) and coupled zwith permanent abnormal enrichment in Ge (3008–3408 ppm). According to single-crystal XRD analyses and Raman spectroscopy, both Hg-poor and Hg-rich sphalerites are single-phase (Zn,Hg)Scub compounds. Pyrite is of diagenetic origin, judging by its trace-element chemistry, particular morphology, and heavy S isotope composition. Another assemblage, composed of Pb-Sb-(Hg) sulfide minerals and lesser As, Cu, Ag, and Bi compounds, results from hydrothermal alteration and is genetically related to Neogene volcano-sedimentary rocks found among the ejecta of the mud volcanoes. The composition of impurities in sphalerite from mud masses indicates crystallization at temperatures lower than ~100 °C, under the leaching effect of mud volcano waters.

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“…The Kerch-Taman MV Province is located on the southern periphery of the Indol-Kuban Trough where it is associated with thick Paleocene-Quaternary sediments that reach a total thickness of 11 km, including 2500-4000 m of Oligocene-Early Miocene homogeneous clayey marine sediments known as the Maykop Formation or Maykop Shale. They are source and parent rocks to the MVs of the vast region and, at the same time, reservoir rocks that store significant resources of oil and gas in the Taman Peninsula and in the basins bordering the Greater Caucasus [3,5,36,37,[51][52][53][54][55].…”

Section: Geological Setting and Paleoenvironmentsmentioning

confidence: 99%

“…The study area is located in the northwestern Kerch Peninsula, on the southern side of the Indol-Kuban Trough (Figure 1) [51,53,59]. The present tectonic framework of the area comprises numerous small W-E folds with curved axes (Figure 1b).…”

Section: The Kerch Peninsula: Local Geology and Maykopian Faciesmentioning

confidence: 99%

Mineralogy and Geochemistry of Mud Volcanic Ejecta: A New Look at Old Issues (A Case Study from the Bulganak Field, Northern Black Sea)

et al. 2018

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We characterise the mineralogy and geochemistry of Oligo-Miocene Maykopian shales that are currently extruded by onshore mud volcanoes of the Kerch-Taman Province (the Northern Black Sea) from the depths of ~2.5–3 km. The ejected muds are remarkable by highly diverse authigenic mineralogy that comprises glauconite, apatite, siderite, mixed Fe–Mg–Mn–(Ca) and Mn–Ca–Fe-carbonates, pyrite, marcasite, sphalerite, cinnabar, chalcopyrite, nukundamite, akantite, native Cu, Au and Au–Ag alloys. Precise geochemical techniques and high-resolution methods are applied to study the composition of bulk rocks, sulphide and carbonate fractions, as well as individual mineral species, including trace element and isotopic compositions of carbonates (C, O) and pyrite (S). Mineralogy of clastic and heavy fractions is used as a provenance tracer. Oxygen-deficient to weakly sulphuric deposition conditions are inferred for the parent sediments proceeding from trace element partitioning between carbonate, sulphide, and metallic phases. The main conclusion of the study is that onshore mud volcanoes of the region only transport buried sedimentary material and authigenic minerals they store to the ground surface.

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Cited by 19 publications

References 15 publications

Two-End-Member Mixing in the Fluids Emitted From Mud Volcano Lei-Gong-Huo, Eastern Taiwan: Evidence From Sr Isotopes

Two-End-Member Mixing in the Fluids Emitted From Mud Volcano Lei-Gong-Huo, Eastern Taiwan: Evidence From Sr Isotopes

Ge-Hg-Rich Sphalerite and Pb, Sb, As, Hg, and Ag Sulfide Assemblages in Mud Volcanoes of Sakhalin Island, Russia: An Insight into Possible Origin

Mineralogy and Geochemistry of Mud Volcanic Ejecta: A New Look at Old Issues (A Case Study from the Bulganak Field, Northern Black Sea)

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